From the preceding can be judged the extraordinary favour these productions enjoyed. From their origin they were diffused through the whole of Europe, and attracted the attention of excellent artists. Nevertheless their beginnings were difficult. The movable types used, cut separately in wood, were not constituted to give an ideal impression. We can understand the cost that the execution of these characters must have occasioned, made as they were one by one without the possibility of ever making them perfectly uniform. Progress was to substitute for this irregular process types that were similar, identical, easily produced, and used for a long time without breaking. Following on the essays of Laurent Coster, continuous researches bore on this point; but as the invention was said to be his, and it being of importance to him not to divulge it, so that he should not lose his profit, much time was lost over it in his workshop without much success. Here history is somewhat confused. Hadrian Junius positively accuses one of Laurent Coster's workmen of having stolen the secrets of his master and taken flight to Mayence, where he afterwards founded a printing office. According to Junius, the metal type was the discovery of the Dutchman, and the name of the thief was John. Who was this John? Was it John Gaensefleisch, called Gutenberg, or possibly John Fust? But it is not at all apparent that Gutenberg, a gentleman of Mayence, exiled from his country, was ever in the service of the Dutch inventor. As to Fust, we believe his only intervention in the association of printers of Mayence was as a money-lender, from which may be comprehended the unlikelihood of his having been with Coster, the more so as we find Gutenberg retired to Strasbourg, where he pursued his researches. There he was, as it were, out of his sphere, a ruined noble whose great knowledge was bent entirely on invention. Doubtless, like many others, he may have had in his hands one of the printed works of Laurent Coster, and conceived the idea of appropriating the infant process. In 1439 he was associated with two artisans of the city of Strasbourg, ostensibly in the fabrication of mirrors, which may be otherwise understood as printing of _Speculums_, the Latin word signifying the same thing. These men needed to surround themselves with precautions; printing was as yet only a practical means of multiplying manuscripts, to impose a little on the innocent, and fortune awaited him who, without saying anything, made this invention serve him. The following will prove this, as well as its tendency.